package com.utils;

import android.util.Log;

public class CRC16 {
	public static int[] crc(int[] data) {
		int[] temdata = new int[data.length + 2];
		// unsigned char alen = *aStr – 2; //CRC16只计算前两部分
		int xda, xdapoly;
		int i, j, xdabit;
		xda = 0xFFFF;
		xdapoly = 0xA001; // (X**16 + X**15 + X**2 + 1)
		for (i = 0; i < data.length; i++) {
			xda ^= data[i];
			for (j = 0; j < 8; j++) {
				xdabit = (int) (xda & 0x01);
				xda >>= 1;
				if (xdabit == 1)
					xda ^= xdapoly;
			}
		}
		System.arraycopy(data, 0, temdata, 0, data.length);
		temdata[temdata.length - 2] = (int) (xda & 0xFF);
		temdata[temdata.length - 1] = (int) (xda >> 8);
		return temdata;
	}

	public static String convertF(int srcx) {
		String src = srcx + "";
		String xx = "";
		if(src.equals("1"))
		{ xx = src;
		 }

		if(src.equals("0"))
		{ xx = src;}
		if(src.equals("2"))
		{ xx = src;}
		if(src.equals("3"))
		{ xx = src;}
		if(src.equals("4"))
		{ xx = src;}
		if(src.equals("5"))
		{ xx = src;}
		if(src.equals("6"))
		{ xx = src;}
		if(src.equals("7"))
		{ xx = src;}
		if(src.equals("8"))
		{ xx = src;}
		if(src.equals("9"))
		{ xx = src;}
		if(src.equals("10"))
		{ xx = "a";}
		if(src.equals("11"))
		{ xx = "b";}
		if(src.equals("12"))
		{ xx = "c";}
		if(src.equals("13"))
		{ xx = "d";}
		if(src.equals("14"))
		{ xx = "e";}
		if(src.equals("15"))
		{ xx = "f";}
		return xx;

	}

	public static String convert16(String src) {
		 String xx = "";if(src.equals("1"))
		{ xx = src;}

		if(src.equals("0"))
		{ xx = src;}
		if(src.equals("2"))
		{ xx = src;}
		if(src.equals("3"))
		{ xx = src;}
		if(src.equals("4"))
		{ xx = src;}
		if(src.equals("5"))
		{ xx = src;}
		if(src.equals("6"))
		{ xx = src;}
		if(src.equals("7"))
		{ xx = src;}
		if(src.equals("8"))
		{ xx = src;}
		if(src.equals("9"))
		{ xx = src;}
		 if(src.equals("a"))
		 { xx = "10";}
		if(src.equals("b"))
		{ xx = "11";}
		if(src.equals("c"))
		{ xx = "12";}
		if(src.equals("d"))
		{ xx = "13";}
		if(src.equals("e"))
		{ xx = "14";}
		if(src.equals("f"))
		{ xx = "15";}
		 return xx;

	}
	private static int parse(char c) {
		if (c >= 'a'){
			return (c - 'a' + 10) & 0x0f;
		}

		if (c >= 'A'){
			return (c - 'A' + 10) & 0x0f;
		}

		return (c - '0') & 0x0f;
	}

	public static byte[] HexString2Bytes(String hexstr) {
		byte[] b = new byte[hexstr.length() / 2];
		int j = 0;

		for (int i = 0; i < b.length; i++) {
			char c0 = hexstr.charAt(j++);
			char c1 = hexstr.charAt(j++);

			b[i] = (byte) ((parse(c0) << 4) | parse(c1));
		}

		return b;
	}


	public static StringBuffer crc16(String alldata) {


		String pref = alldata.substring(0,6);
		String adata = alldata.substring(6);
		int[] crc = null,data1;

		data1=crc;

		//String adata="01050010FF00";


		String ad=adata.substring(2, 4);

		int[] w=new int[adata.length()/2];

		for (int i = 0; i <adata.length(); i=i+2) {


			ad=adata.substring(i,i+2);

			w[i/2]=Integer.parseInt(ad,16);

		}

		int[] data=w;

		int[] stem=new int[data.length+2];

		int a,b,c;


		a=0xFFFF;

		b=0xA001;


		for (int i = 0; i < data.length; i++) {

			a^=data[i];

			for (int j = 0; j < 8; j++) {


				c=(int)(a&0x01);

				a>>=1;

				if (c==1) {

					a^=b;

				}
				System.arraycopy(data, 0, stem, 0, data.length);

				stem[stem.length-2]=(int)(a&0xFF);
				stem[stem.length-1]=(int)(a>>8);
			}
		}

		int[] z = stem;

		StringBuffer s = new StringBuffer();
		s.append(pref);

		for (int j = 0; j < z.length; j++) {

			s.append(String.format("%02x", z[j]));

		}

		System.out.print(s);
		return s;


	}



	public static StringBuffer crc16x(String alldata) {


		String pref = alldata.substring(0,6);
		String adata = alldata.substring(6);
		int[] crc = null,data1;

		data1=crc;

		//String adata="01050010FF00";


		String ad=adata.substring(2, 4);

		int[] w=new int[adata.length()/2];

		for (int i = 0; i <adata.length(); i=i+2) {


			ad=adata.substring(i,i+2);

			w[i/2]=Integer.parseInt(ad,16);

		}

		int[] data=w;

		int[] stem=new int[data.length+2];

		int a,b,c;


		a=0xFFFF;

		b=0xA001;


		for (int i = 0; i < data.length; i++) {

			a^=data[i];

			for (int j = 0; j < 8; j++) {


				c=(int)(a&0x01);

				a>>=1;

				if (c==1) {

					a^=b;

				}
				System.arraycopy(data, 0, stem, 0, data.length);

				stem[stem.length-2]=(int)(a&0xFF);
				stem[stem.length-1]=(int)(a>>8);
			}
		}

		int[] z = stem;

		StringBuffer s = new StringBuffer();
		s.append(pref);

		for (int j = 0; j < z.length; j++) {

			s.append(String.format("%02X", z[j]));

		}

		System.out.print(s);
		return s;


	}


	public static String expandStr(String cmdStr) {


//		 String retStr = "";
//
//		retStr = cmdStr.substring(0,4)+"0100";
//		retStr = retStr + cmdStr.substring(4,6);
	//	return retStr;

		String retStr = "";

		retStr = cmdStr.substring(0,4)+"00";
		//Log.e("0,400",retStr);
		retStr = retStr + cmdStr.substring(6,8);
		//Log.e("6,8",retStr);
		retStr = retStr + cmdStr.substring(4,6);
		//Log.e("4,6",retStr);

		return retStr;
	}

	/**
	 * 用于字符串转换
	 * 
	 * 
	 * @author Chu Guimin
	 */
	public static String myCRC16(String string) {

		byte[] tempByte =  TransformUtils.hexStringToBytes(string);
		int[] data = { 0, 0, 0, 0, 0, 0 };// 代表指令和数据的六个字节
		for (int i = 0; i < data.length; i++) {
			// 将16进制数转换为int类型
			data[i] = TransformUtils.byteToInt(tempByte[i + 3]);
		}
		int[] d1 = CRC16.crc(data);// CRC16校验
		for (int i = 0; i < d1.length; i++) {
			// 将int类型转换为16进制数
			tempByte[i + 3] = TransformUtils.intToByte(d1[i]);
		}

		return TransformUtils.bytesToHexString(tempByte);
	}

	public static char Crc16Calc(byte[] data_arr, int data_len)
	{
		char crc16 = 0;
		int i;
		for(i =0; i < (data_len); i++)
		{
			crc16 = (char)(( crc16 >> 8) | (crc16 << 8));
			crc16 ^= data_arr[i]& 0xFF;
			crc16 ^= (char)(( crc16 & 0xFF) >> 4);
			crc16 ^= (char)(( crc16 << 8) << 4);
			crc16 ^= (char)((( crc16 & 0xFF) << 4) << 1);
		}
		return crc16;
	}

}
